Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1993-10-26
1996-09-24
Bertsch, Richard A.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417571, 137856, 137857, F04B 5310
Patent
active
055585086
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hermetic compressor in which two discharge holes are formed and discharge reeds are placed therein.
BACKGROUND ART
Presently, there are great demands for, the improvement of the compression efficiency of a reciprocating-type hermetic compressor used for a cooling system, such as a refrigerator or a freezer.
A conventional hermetic compressor of this type is disclosed in U.S. Pat. No. 4,723,896, and constructed as follows. The volume of a discharge hole arranged on a valve plate is made small so as to improve compression efficiency. Also, a reed valve is positioned on the discharge hole of the valve plate, and a supporting spring, a valve stopper and a retaining spring are arranged on the reed valve, thus temporarily retaining these members. When a cylinder head is secured to a cylinder block, the retaining spring is pressed so as to secure the cylinder head and the cylinder block.
However, such a conventional hermetic compressor has a problem in that testing of correct positioning of the reed valve for closing the discharge hole and the spring reed for urging the reed valve in the closing direction so as to yield proper operation cannot be performed using only these two members.
Also, in a machine having a greater cylinder volume, having only a single discharge hole might increase the over-compression loss, thus causing a reduction in the compression efficiency. The over-compression loss is caused by the following phenomenon. When the pressure within a cylinder reaches a high level, and such a high pressure slightly exceeds the opening pressure of a discharge reed valve, the discharge reed valve is opened. The small difference between the high pressure and the opening pressure of the discharge reed valve causes the over-compression loss.
DISCLOSURE OF INVENTION
Accordingly, an object of the present invention is to form a recess in a valve plate and to form two discharge holes in the recess which comprises a reed valve for closing the respective discharge holes independently, a spring reed for urging the reed valve in the closing direction and a stopper for pressing the spring reed and the reed valve, thus securing the stopper to the valve plate.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a sectional view of a hermetic compressor according to the present invention;
FIG. 2 is a longitudinal sectional view of a compressor unit shown in FIG. 1;
FIG. 3 is a sectional view taken on line 3--3 of FIG. 2;
FIG. 4 is an exploded perspective view of a valve plate according to the present invention; and
FIG. 5 is a sectional view showing a discharge reed of the present invention, which is closed.
BEST MODE FOR CARRYING OUT THE INVENTION
A detailed description of the present invention will be described herein with reference to the drawings.
Reference numeral 1 indicates a hermetic case obtained by fitting an upper case 1a into the periphery of a lower case 1b and by welding the connecting portion therebetween. A motor unit 2 providing a driving source and a compressor unit 3 compressing a refrigerant gas are elastically supported within the hermetic case 1.
The motor unit 2 comprises a stator 4, a rotor 5 and a crank shaft 6 into which the rotor 5 is fitted.
The compressor unit 3 is placed below the motor unit 2 and secures a cylinder block 9 having a cylinder 8 with an opening 7 and a supporting member 10 for supporting the crank shaft 6 of the motor unit 2 via a screw N. A piston 11 and a crank portion 12 of the crank shaft 6 are interconnected via a connecting rod 13 in order to reciprocate the piston 11 accommodated within the cylinder 8.
An oil feeding tube 19 fitted at the bottom of the crank shaft 6 feeds lubricating oil pooled at the bottom of the lower case 1b to a machine by the rotation of the crank shaft 6.
A supporting pin 14 secured on the lower case 1b of the hermetic case 1 and a securing pin 15 elastically support the cylinder block 9 of the compressor unit 3 by way of a compressor spring 16.
A power-supply terminal 17 arranged on the lower ca
REFERENCES:
patent: 4628963 (1986-12-01), Ishijima et al.
patent: 4723896 (1988-02-01), Fritchman
patent: 5110272 (1992-05-01), Peruzzi et al.
patent: 5209260 (1993-05-01), Baek
Hamada Koshi
Kubota Akihiko
Sasano Hiroshi
Bertsch Richard A.
Matsushita Refrigeration Company
McAndrews, Jr. Roland G.
LandOfFree
Reed-type discharge valve arrangement for a hermetic compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reed-type discharge valve arrangement for a hermetic compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reed-type discharge valve arrangement for a hermetic compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1924934